Means for adjusting oil burners for low capacity burning



Nov. 28, 1939.

EC. VOLLMER mmus FOR .wwswme p11; sununnslma LOW CAPACITY BURNING FiledApril 2'7, 1938 7 0, VOLLMER INVENTOR,

AT ORNEY I Patented Nov. 28, 1939 UNITED STATES MEANS FOR ADJUSTING OILBURNERS FOR LOW CAPACITY BURNING Earl C. Vollmer, Rock Island, 111.,assignor to Micro-Weston, Incorporated, Bettendorf, Iowa, a corporationof Delaware 1 Application April 27, 1938, Serial No. 204,627

3 Claims.

The present invention pertains to oil burners and more particularly tothe art and apparatus for operating an oil burner at low capacity.

Among the objects of this invention are the provision of means in an oilburner such that the burner can be set to operate so as to burn a smallquantity of oil and yet the same will be burned efliciently; to providemeans for readily adjusting the amount of air which is permitted tocirculate around the oil burner nozzle so that the proper amount ofoxygen will be delivered to the oil fed by the burner to produce propercombustion; to provide a novel mode of adjusting the feed of the airaround the oil burner nozzle; and 5 such further objects, advantages,and capabilities as will hereafter appear and as are inherent in theconstruction disclosed herein. My invention further resides in thecombination, construction, and arrangement of parts illustrated in theaccompanying drawing and, while I have shown therein what is nowregarded as the preferred embodiment of this invention, I desire thesame to be understood as illustrative only and not to be interpreted ina limiting sense.

The annexed drawing represents, in elevation, an oil burner, partlybroken away and in section, embodying my present invention.

Reference will now be made in greater detail to the annexed drawing fora more complete dis- 9 closure of this invention. The right hand portionof the figure shows conventionally an oil burner designated in generalby the numeral I.

The damper mechanism of this burner is similar to that shown in myPatent No. 2,078,884, issued cated at 2 and the fuel-carrying tube at 3.At the forward end of the fuel tube 3 is located the nozzle 4, as iscustomary in this art. A plurality of helical vanes 5 is located in theforward end 0 of the air-carrying tube 2, and this tube is provided atits forward end with an inwardly tapering ring 6 which forms aconstriction at the forward end of the air tube whereby to producegreater turbulence of the mixture of air and oil 3 so that the mixturewill burn more readily. -Byy April 27, 1937. The air-carrying tube isindi- I l which has screw-threaded connection at one of its ends withmember 10 and is held in position 10 in the burner casing, at itsopposite end, by means of the nuts I2 and I3 and the spring l4. A washeror washers l5 are interposed between the nut l2 and the spring l4. Asthe rod l I is rotated, it turns into or withdraws from the membet l0and, being held fixed at its opposite end, it causes movement of themember "I. By means of this adjustment, the space between the elements 8and I!) may be adjusted to regulate the amount of air passing betweenthese members so as to adapt it to the amount of fuel passing'throughthe nozzle 4. In this way, the supply of air can be adjusted so thatthere will be just enough passing through the sleeve 8 and around thenozzle 4 to combine properly with the fuel preparatory to its beingmixed with the main air supply passing between the helical vanes 5.Also, varying the spacing between the elements 8 and I0 varies theair-carrying capacity in the vicinity of the forward end of the tube 2and therefore varies the. velocity of the air in the vicinity of thenozzle, thus making it possible to adjust the air discharge inaccordance with the amount of oil being consumed. Furthermore, thismechanism makes possible the adjustment desired dur- 36 ing theoperation of the burner; hence, it is easy to secure the desiredadjustment under operating conditions.

It will of course be understood that the specifl description ofstructure set forth above may be 40 departed from without departing fromthe spirit of this invention as set forthin this specification and theappended claims.

Having now described my invention, I claim:

' 1,. In a low capacity oil burner comprising an air carrying conduit,8. fuel tube extending longitudinally inside said conduit, said fueltube having a fuel nozzle located at its forward end adjacent the airoutlet end of said conduit. a cylindrical ring inside and spaced fromsaid air conduit substantially concentric with respect to the axis ofsaid nozzle with the forward end of said nozzle approximately in theplane of the forward edge of said ring, the rear edge of the ring beingsubstantially rearward of the forward member.

end or said nozzle and beingtcrward oi the rear spiral baiiles betweensaid ring and said conduit.

end of said-nozzle. and a member slidable along 8. In a low capacity oilburner comprising a said fuel tube to a position engaging said ringstructure as defined in claim 1, means in engageto prevent air frompassing through said ring and ment with said member and extendingtherefrom adjustable to positions spaced from said ring to to a positionoutside said conduit for adjusting allow air to pass between said ringand said said member along said fuel tube with the burn- I v er inassembled position. 2. In a low capacity oil burner comprising astructure .as defined. in claim 1,. a. plurality of EARL C. VOLLMER.

